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War in a Box: Paper Tanks

Originally an iOS app, this lightweight tower defense game features 5 types of towers versus 7 enemy vehicle classes, battling it out throughout a 24-level campaign and two difficulty modes.
A demo is available on Desura, and the game has appeared on Steam Greenlight.

X-Plane 10

X-Plane 10 Global is the world’s most comprehensive and powerful flight simulator for personal computers, and it offers the most realistic flight model available.

X-Plane is not a game, but an engineering tool that can be used to predict the flying qualities of fixed- and rotary-wing aircraft with incredible accuracy.

Ys: The Oath in Felghana

Ys: The Oath in Felghana is a Japanese Action RPG by Nihon Falcom. It is a remake of the third game in the Ys series, Ys III: Wanderers from Ys.

This game, like all Ys games, has a strong focus on story-telling, much like the Final Fantasy series (for those who are not familiar with the Ys series).

The Tiny Bang Story

The Tiny Bang Story is set in a fictitious world that is hit by an asteroid, leaving you to literally pick up the pieces and put it back together. Over several chapters, you need to rebuild machines and solve puzzles to find all the pieces you need to rebuild the world.

XCOM: Enemy Unknown

XCOM: Enemy Unknown is a remake of the 1994 classic strategy game UFO: Enemy Unknown, also known as X-COM: UFO Defense. Unlike the previously announced XCOM by 2K Marin, this game will return to the strategic root of the X-COM series.

Superbrothers: Sword & Sworcery EP

Superbrothers: Sword & Sworcery EP is an exploratory action adventure videogame with an emphasis on audiovisual style. Traverse a mythic little realm, use a sword to do battle & evoke sworcery to solve mystical musical mysteries. Co-operate with friends via Twitter, experience a videogame world that is affected by moon phases & help a wandering warrior monk complete her woeful errand.

Blocks That Matter

Blocks That Matter (also known as BTM) is a two-dimensional indie puzzle platformer developed by Swing Swing Submarine. The player takes the role of “tetrabot”, a robot which is able to collect blocks by jumping into them or drilling them, and can then construct shapes in a “puzzle mode” using four blocks at a time. BTM heavily references the games Minecraft and Tetris through the main characters, in-game mechanics and concepts such as “Pajitnovian physics”.

Atom Zombie Smasher

Atom Zombie Smasher is a real-time strategy game developed by independent developer Blendo Games. In this game, the player attempts to rescue as many citizens as possible from an oncoming zombie horde using helicopter rescue units. As the player progresses, various weapon teams are unlocked that can be deployed to slow the zombie forces while the citizens are rescued.

This game is surprisingly fun and addictive.

A Valley Without Wind

The Creators Of AI War Bring You...

A 2D sidescroller without a linear path. An action game with tactical combat and citybuilding. An adventure game that lets you free-roam a vast, procedurally-generated world. A Valley Without Wind defies genre stereotypes. Unlike other procedurally-generated games, you also get a logical progression in difficulty, plus helpful tips and checklists to guide your travels (should you need them).

Splice

This indie game allows you to play God by moving cells with other cells and stuff happens, somehow. You have to move the cells or capsules to match the pattern shown. I'm not really sure what happens or what the purpose is, but at least you can do it in multimon.